Question

help please


find the exact values of each expression.
A) sin45 degrees+ cos 60 degrees
b)sin 45 degrees *cos 45 degrees
c)2 sin pi/3-3 tan pi/6

Answer 1

Good morning! Have you a table of values of the sine, cosine and tangent of "easy" angles such as 45 and 60 degrees? pi/6 and p/3 radians? If not, how would you evaluate the sine of 45 degrees?

Answer 2

i dont know what your talking about.

Answer 3

@thomaster

Answer 4

Sorry, jazzyfa, but being able to find the sine, cosine and tangent of 30, 45, 60 and 90 degrees is absolutely basic to "knowing" trigonometry. Do you know what the name "sine" signifies? If so, how is the sine of an angle defined?

Answer 5

can you please just show me how to work the problem this has to be in in 30 mins

Answer 6

Again, you'll need to be able to find the values of sin 45 degrees and cos 60 degrees, just to do the first problem. What is the value of sin 45? of cos 60?

Answer 7

If you have a trig textbook, these values will be in a table in that book. If you're taking an online course, I would hope that your instructor has posted a similar table of values of the trig functions.

Answer 8

http://www.mathwords.com/t/trig_values_of_special_angles.htm
im not in trig im in pre cal

Answer 9

Good table. Please use this table to find sin 45 degrees.
Also find cos 60 degrees.

Answer 10

sin 45 is \[\sqrt{2}/2\] and cos 60 is 1/2

Answer 11

You're doing fine! Then: sin45 degrees+ cos 60 degrees=\[\frac{ \sqrt{2} }{ 2 }+\frac{ 1 }{ 2}=?\]

Answer 12

Actually, this answer is good enough. I'd suggest you move on to the next question (B), and come back to (A) for more simplification, if you have time.

Answer 13

i have to finish it out all the way to the end

Answer 14

Fine. Please explain to me what you mean by that and how you would "finish it all the way out." Better yet, do it.

Answer 15

idk all i know is that it has to be in simplest form

Answer 16

I would either leave our result as is:\[\frac{ \sqrt{2} }{ 2 }+\frac{ 1 }{ 2},\] or combine the two fractions into one:\[\frac{ \sqrt{2} }{ 2 }+\frac{ 1 }{ 2}=\frac{ \sqrt{2}+1 }{ 2 }\]

Answer 17

Now please do B.

Answer 18

sin 45 is squareroot 2/2 and cos 45 is squareroot 2/2

Answer 19

Agreed. And what are you supposed to do with those two results?

Answer 20

combine

Answer 21

"combine" refers to addition or subtraction. Is that what we have in B?

Answer 22

ohhh multiply

Answer 23

Please do that multiplication, OK?

Answer 24

.5

Answer 25

OK. I'd prefer you show your work, but yes, the correct result is 0.5.
Part C?
do as much of the work there as you can by yourself.

Answer 26

idk where to start

Answer 27

1. find sin (pi/3) from your table.
2. multiply your result by 2 and simplify that result.

Answer 28

its 60 degrees

Answer 29

Yes, and sin (pi/3) has what value?

Answer 30

its squareroot 3/2

Answer 31

1. find sin (pi/3) from your table.
2. multiply your result by 2 and simplify that result.

Answer 32

1.7320

Answer 33

True, but leave your answer as Sqrt(3):\[2\frac{ \sqrt{3} }{ 2 }=?\]

Answer 34

my answer is 0

Answer 35

Right. Nice work. Good luck to you!

Answer 36

thanks

Answer 37

Yo're welcome!